Joiplay got updated, probably just for betas(not sure about this)
And it says "added support for mkxp-z based games with ruby 3. Games must contain mkxp.json and Plugins folder to be detected as a mkxp-z game"
I just saw that mkxp.json is in the patch, so may I ask what is the plugins folder joiplay is talking about? The game doesn't still work only with mkxp.json